1555661560 has 16 divisors (see below), whose sum is σ = 3500238600. Its totient is φ = 622264608.

The previous prime is 1555661533. The next prime is 1555661573. The reversal of 1555661560 is 651665551.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 38891539 = 1555661560 / (1 + 5 + 5 + 5 + 6 + 6 + 1 + 5 + 6 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19445730 + ... + 19445809.

Almost surely, 2^1555661560 is an apocalyptic number.

1555661560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555661560 is an abundant number, since it is smaller than the sum of its proper divisors (1944577040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555661560 is a wasteful number, since it uses less digits than its factorization.

1555661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38891550 (or 38891546 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 1555661560 is about 39441.8757160458. The cubic root of 1555661560 is about 1158.7018672886.

The spelling of 1555661560 in words is "one billion, five hundred fifty-five million, six hundred sixty-one thousand, five hundred sixty".